Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a79b69f97d87df…

MALICIOUS

PDF

95.0 KB Created: 2021-07-26 02:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb4c30cc3d1e6b4a90a82c46c1baaf81 SHA-1: 9dd597a49aa4b7f3bdbcbebf63df1e238a22059c SHA-256: 91a79b69f97d87dffc6c062cc925c8b643cc668fef2879d8a59e70d550130d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/22e5a62cc5d48e4e188f8fb6e9465e94/vuzufise.pdf In PDF document text
    • https://tonitomov.com/picture/file/zagikabaseretizikibubu.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/xebewedunozi.pdfIn PDF document text
    • https://blokhol.com/upload/files/31489484233.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/lutikazupu.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202107074133_613621478.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ddb56fde---nesowozasidimenuvunaja.pdfIn PDF document text
    • http://beateromer.com/bilder/file/93239037943.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076175fc7c79---50534671816.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d8e2b079c8306299f1799e56d368c511/40413011345.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b5ef0eb4---36997936581.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae03f1f81---ludamezugumaxo.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/85116420008.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d61d7d94f---vilelavimenavepozu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4b95457f---81176710511.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f170b9cefae6993775ce763a14f57e4e/17474972479.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jd0tuublbihm76palk7ll811d7/7714762234.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xuxetibozanejopazujep.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e836c088b---sofupigefexadoxak.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t9pdu6j7tl77m3dmf7hghl8u83/41880368220.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea033e852---rovojusukejevo.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/wewuvitolu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074372f13d3a---milupigilomizafosaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=como+calcular+la+media+mediana+y+moda+en+datos+agrupados+en+excelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 11204 bytes
SHA-256: 1ef1e0520f33f6ef3d5f4a97bd7668cb892cd7f59342f26e3673b56442defe01
font_02_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 19384 bytes
SHA-256: 47a9986d1750d940cb7132ca198555ed91a4bb248e25efa528953111a3a98b7c

Open this report in the interactive analyzer, or submit your own file for analysis.